Difference between lights connected in series and parallel

When two same lamps are connected with the same battery. Their lighting will be greater when they are connected in series or parallel?2. Relevant equations
Series U=U1+U2+U3+...
I=I1=I2=I3...
Parallel U=U1=U2=U3...
I=I1+I2+I3+...

3. The attempt at a solution
The answer is when they are connected in parallel. But why?
Is it related to the tension or intensity or power?

In a very simple view, the brightness of a light bulb is proportional to the power it consumes. The power is determined by the voltage across the bulb and the current through it: ##P = V I##.

If you assume that the bulb has a constant resistance (again, a simple view), then Ohm's Law tells you that the current through it is related to the voltage across it by ##I = V/R##.

Use your knowledge of how voltage and current are distributed among components in series and parallel circuits.

So we can write P=U^2/R
U is the same in each resistance in parallel, but it divides in resistances in series. So it is greater in resistances in parallel. This way P is greater when they are connected in parallel. Am I right?

Staff: Mentor

So we can write P=U^2/R
U is the same in each resistance in parallel, but it divides in resistances in series. So it is greater in resistances in parallel. This way P is greater when they are connected in parallel. Am I right?